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Montana Field Guide

Montana Field Guides

Bog Yellowcress - Rorippa palustris
Other Names:  Rorippa islandica

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Taprooted annual to short-lived perennial. Stems usually erect, 10–100 cm. Leaves basal and cauline; the lower leaves 3–15 cm long, petiolate, auriculate-clasping, oblanceolate, pinnately lobed and dentate; upper leaves similar, smaller, less divided and toothed. Vestiture of sparse, simple hairs below or plants glabrous. Petals yellow, 1.5–3 mm long. Fruit an ovoid silicle, 2–5 × 2–3 mm, glabrous; style 0.3–1 mm long; pedicels spreading, 3–10 mm long, longer than the silicle (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Montana has varieties palustris, hispida (Desv.) Butters & Abbe, and fernaldiana Butters & Abbe

Species Range
Montana Range


Range Comments
Throughout most of North America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 30

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Wet, often disturbed soil of fields, roadsides and along streams, wetlands; plains, valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Additional ReferencesLegend:   View Online Publication
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    • Jorgensen, H.E. 1970. Ecological aspects of the life history of Agropyron smithii Rydb. in Central Montana, with related effects of selective herbicide treatments of rangeland. Ph.D. Dissertation. Bozeman, MT: Montana State University. 118 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Bog Yellowcress — Rorippa palustris.  Montana Field Guide.  .  Retrieved on , from